MySql.Data.MySqlClient.MySqlDataReader.GetString C# (CSharp) Method

    public override String GetString(int i)
    {
      IMySqlValue val = GetFieldValue(i, true);

      if (val is MySqlBinary)
      {
        byte[] v = ((MySqlBinary)val).Value;
        return resultSet.Fields[i].Encoding.GetString(v, 0, v.Length);
      }

      return val.Value.ToString();
    }

        public ReceiveManager(MySqlDataReader dataReader,MetroForm _login)
        {
            InitializeComponent();
            login = _login;
            this.FormClosing += ReceiveManager_FormClosing;
            worker_id = dataReader.GetString("worker_name");
            this.Text = "欢迎回来，" + dataReader.GetString("worker_name");
            dataReader.Close();
            DataGridViewButtonColumn request_column = new DataGridViewButtonColumn();
            request_column.HeaderText = "请求";
            //gigUrlColumn.Name = "Gig Url name";
            request_column.Text = "确认";
            request_column.UseColumnTextForButtonValue = true;
            request_column.Width = 106;
            WaitToConfrimDataGridView.Columns.Add(request_column);
            WaitToConfrimDataGridView.DataSource = FillDataGrid();

            DataGridViewButtonColumn request2_column = new DataGridViewButtonColumn();
            request2_column.HeaderText = "请求";
            //gigUrlColumn.Name = "Gig Url name";
            request2_column.Text = "接货成功";
            request2_column.UseColumnTextForButtonValue = true;
            request2_column.Width = 106;
            CheckGridView.Columns.Add(request2_column);
            CheckGridView.DataSource = FillCheckData();
        }